You can't yet. DLT doesn't support "catalog". What you can do however is import to a target schema in your hive_metastore and then "upgrade" that schema to Unity Catalog. The originating pipeline pointing at the old schema pipes into the appropriate place in UC. I'm personally not doing this because it feels like a temporary hack and am waiting until DLT fully supports "catalog" with schema as a variable in @dlt.table(name, schema).